Air filtration device



FIG. 1 is a top perspective view of an air filtration device in accordance with our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left-side elevational view thereof, a right-side elevational view thereof being a mirror image; and,

FIG. 6 is a rear elevational view thereof.

The broken lines in the figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an air filtration device, as shown and described. 